Blar i NTNU Open på forfatter "Wiik, Kjell"
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Dipentamethylene thiuram tetrasulfide-based cathodes for rechargeable magnesium batteries
Kaland, Henning; Hadler-Jacobsen, Jacob; Fagerli, Frode Håskjold; Wagner, Nils Peter; Schnell, Sondre Kvalvåg; Wiik, Kjell (Peer reviewed; Journal article, 2020)Rechargeable Mg batteries (RMBs) represent a possible route for low-cost energy storage applications, but they are lacking a satisfactory cathode material. Conventional sulfur (S8) cathodes have shown promise, yet they ... -
The effect of alkaline earth metal substitution on thermoelectric properties of A0.98La0.02MnO3-δ (A=Ca,Ba)
Singh, Sathya Prakash; Kanas, Nikola; Einarsrud, Mari-Ann; Wiik, Kjell (Peer reviewed; Journal article, 2022)The thermoelectric properties of ceramics with composition A0.98La0.02MnO3-δ are anticipated to vary with the basicity and atomic portion of the alkaline earth metal, A. In the present investigation ceramic powder precursors ... -
Effect of B-site substitution on the stability of La0.2Sr0.8Fe0.8B0.2O3-delta, B = Al, Ga, Cr, Ti, Ta, Nb
Lohne, Ørjan Fossmark; Gurauskis, Jonas; Phung, Tan Nhut; Einarsrud, Mari-Ann; Grande, Tor; Bouwmeester, Henny J. M.; Wiik, Kjell (Journal article; Peer reviewed, 2012)Single phase, cubic perovskites of composition La0.2Sr0.8Fe0.8B0.2O3 − δ, B = Al, Ga, Cr, Ti, Ta and Nb, were prepared by spray pyrolysis from aqueous precursor solutions. The effect of B-site substitution on the stability ... -
Effect of coating density on oxidation resistance and Cr vaporization from solid oxide fuel cell interconnects
Talic, Belma; Falk-Windisch, Hannes; Venkatachalam, Vinothini; Hendriksen, Peter Vang; Wiik, Kjell; Lein, Hilde Lea (Journal article; Peer reviewed, 2017)Manganese cobalt spinel oxides are promising materials for protective coatings for solid oxide fuel cell (SOFC) interconnects. To achieve high density such coatings are often sintered in a two-step procedure, involving ... -
Effect of marine environment on the tribology performance of materials used in lubricated rotating parts of offshore wind turbines
Nyhus, Toril (Master thesis, 2012)The use of offshore wind turbines as a source of renewable energy is promising. However, many challenges have to be solved before they will be cost effective. The operation time, without any maintenance required, is desired ... -
Environmentally friendly substitute of phenolic resin in solid state sintered silicon carbide
Skjelstad,Sigrid (Master thesis, 2020)Silisiumkarbid er et meget kovalent materiale med mange enestående egenskaper. På grunn av de sterke, kovalente bindingene er det vanskelig å oppnå høye tettheter ved sintring og sintringsadditiver som karbon og bor m ̊a ... -
Exploring V2C MXene as Cathode Constituent for Rechargeable Magnesium Batteries
Boge, Lars-Arne (Master thesis, 2019)Oppladbare magnesiumbatterier er spådd å kunne utkonkurrere moderne Li-ion-batterier når det kommer til volumetrisk kapasitet, sikkerhet, pris og skaleringspotensiale. Hovedutfordringene som står i veien for utviklingen ... -
Fibre reinforced lightweight aggregates
Bernhardt, Markus; Tellesbø, Hilde; Justnes, Harald; Wiik, Kjell (Journal article; Peer reviewed, 2014)Carbon steel fibre reinforced lightweight aggregates (LWA) were produced in a pilot scale rotary kiln. Narrow size fractions as well as not-sieved (asreceived) material were investigated according to European standards ... -
High temperature X-ray diffraction and thermo-gravimetrical analysis of the cubic perovskite Ba0.5Sr0.5Co0.8Fe0.2O3-δ under different atmospheres
Sahini, Mtabazi Geofrey; Tolchard, Julian R; Wiik, Kjell; Grande, Tor (Journal article; Peer reviewed, 2015)Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) with the cubic perovskite structure is known to be metastable at low temperature under an oxidizing atmosphere. Here, the thermal and chemical expansion of BSCF were studied by in situ high ... -
Hot corrosion of Gd2Zr2O7, Gd2Zr2O7/YbSZ, YSZ+Gd2Zr2O7/YbSZ, and YSZ thermal barrier coatings exposed to Na2SO4+V2O5.
Tabeshfar, Mohadese; Salehi, Mehdi; Dini, Ghasem; Dahl, Paul Inge; Einarsrud, Mari-Ann; Wiik, Kjell (Peer reviewed; Journal article, 2020)Gd2Zr2O7 ceramic is considered as a potential candidate for thermal barrier coatings. Here we present hot corrosion behavior of single layer Gd2Zr2O7 (GZO), Gd2Zr2O7 + 50 wt% YbSZ (GZO/YbSZ), YSZ and double-layer ... -
Hydrothermal Synthesis of LaFeO3
Reksten, Anita (Master thesis, 2011)This work explores the hydrothermal synthesis of LaFeO3 (LFO) nanorods with a high aspect ratio. Synthesis of rod shaped LFO is a stepping stone to the synthesis of strontium doped LFO (LSF) nanorods with high aspect ratio. ... -
Influence of processing on stability, microstructure and thermoelectric properties of Ca3Co4-xO9+δ
Kanas, Nikola; Singh, Sathya Prakash; Rotan, Magnus; saleemi, Mohsin; Bittner, Michael; Feldhoff, Armin; Norby, Truls Eivind; Wiik, Kjell; Grande, Tor (Journal article; Peer reviewed, 2018)Due to high figure of merit, Ca3Co4-xO9+δ (CCO) has potential as p-type material for high-temperature thermoelectrics. Here, the influence of processing including solid state sintering, spark plasma sintering and ... -
Inter-diffusion across a direct p-n heterojunction of Li-doped NiO and Al-doped ZnO
Desissa, Temesgen D.; Haugsrud, Reidar; Wiik, Kjell; Norby, Truls Eivind (Journal article; Peer reviewed, 2018)We herein report inter-diffusion across the interface between p-type Ni0.98Li0.02O and n-type Zn0.98Al0.02O for various applications including p-n-heterojunction diodes and oxide thermoelectrics. Diffusion couples were ... -
Investigating Methods for Improving the Perforamce of Si in LIBs: Ball Milling in Air and Carbon Coating with Phenolic Resin
Sejersted, Benjamin T. (Master thesis, 2019)Silicon has shown large promise as an alternative to graphite anodes in lithium-ion batteries. The theoretical specific energy capacity of silicon is almost an order of magnitude larger, and silicon is vastly abundant and ... -
Kinetics of reactions between silica and carbon
Wiik, Kjell (Doktor ingeniøravhandling;1990:16, Doctoral thesis, 1990) -
La0.2Sr0.8Fe0.8Ta0.2O3 (-) (delta) based thin film membranes with surface modification for oxygen production
Gurauskis, Jonas; Lohne, Otto; Wiik, Kjell (Journal article; Peer reviewed, 2012)High temperature dense ceramic membranes made from mixed ionic/electronic conducting perovskite ceramics represent a high potential as a reliable source for oxygen and syngas production. In this work, La0.2Sr0.8Fe0.8Ta0.2O3 ... -
Long term stability testing of oxide unicouple thermoelectric modules
Skomedal, Gunstein; Vehus, Tore; Kanas, Nikola; Singh, Sathya Prakash; Einarsrud, Mari-Ann; Wiik, Kjell; Middleton, Peter Hugh (Journal article; Peer reviewed, 2019)Thermoelectric devices based on oxides are good candidates for energy harvesting technologies for use in aggressive conditions where the materials should withstand high temperatures and corrosive environments over prolonged ... -
Manufacturing of perovskite oxygen carriers by spray granulation for chemical looping combustion
Thoréton, Vincent; Darell, Ove; Spjelkavik, Aud I.; Sunding, Martin Fleissner; Mokkelbost, Tommy; Pishahang, Mehdi; Wiik, Kjell; Larring, Yngve (Journal article; Peer reviewed, 2017)Chemical looping combustion is a technology under development that allows power production with inherent separation of CO2 during fuel combustion. Its principle relies on oxygen carrier materials transporting oxygen from ... -
Mechanical properties of lightweight aggregates
Bernhardt, Markus; Tellesbø, Hilde; Justnes, Harald; Wiik, Kjell (Journal article; Peer reviewed, 2013)Lightweight aggregates (LWAs) were successfully produced both in a pilot-scale rotary kiln and in a laboratory chamber furnace. The mechanical properties of LWA were investigated in detail applying the European standard ... -
Metallic Interconnects for Solid Oxide Fuel Cells: High Temperature Corrosion and Protective Spinel Coatings
Talic, Belma (Doctoral thesis at NTNU;2016:221, Doctoral thesis, 2016)Metallic Interconnects for Solid Oxide Fuel Cells: Increasing the share of renewable energy is important in the effort to limit global warming. The challenge with increased dependence on renewable energy sources such ...